From d992a7c56c90586295621cb78b02f0a6f3f9d268 Mon Sep 17 00:00:00 2001
From: snek <the@snek.dev>
Date: Fri, 23 Jan 2026 22:42:19 +0100
Subject: [PATCH] addr: only assign broadcast when subnet over /31

This mirrors how iproute2 and the kernel handle point to point links.
---
 src/addr/builder.rs | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/src/addr/builder.rs b/src/addr/builder.rs
index f01f796..35182ee 100644
--- a/src/addr/builder.rs
+++ b/src/addr/builder.rs
@@ -69,11 +69,7 @@ impl AddressMessageBuilder<Ipv4Addr> {
                 .push(AddressAttribute::Local(address.into()));
 
             // Set the IFA_BROADCAST address as well.
-            if prefix_len == 32 {
-                self.message
-                    .attributes
-                    .push(AddressAttribute::Broadcast(address));
-            } else {
+            if prefix_len < 31 {
                 let ip_addr = u32::from(address);
                 let brd = Ipv4Addr::from(
                     (0xffff_ffff_u32) >> u32::from(prefix_len) | ip_addr,